Count Of Rows

DataGridView.RowCount Property[^]

Hello Mr.Kahlid her's your solution
The below code is written in combobox selected index change u can write it in button click, it will count the total number of rows present in grid view and print it in a messagebox

 private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            int x=0;
            SqlConnection connect = new SqlConnection();
            connect.ConnectionString = "Data Source=.;Initial Catalog=RJIT;Integrated Security=True";
            connect.Open();
            string mycommand = "select * from Inquiry_Table where time_of_inquiry='" + comboBox1.Text + "'";
            SqlCommand cmd = new SqlCommand(mycommand, connect);
            SqlDataAdapter adp = new SqlDataAdapter();
            adp.SelectCommand = cmd;
            DataSet ds = new DataSet();
            DataTable dt;
            adp.Fill(ds);
            dt = ds.Tables[0];
            SqlDataReader dr = cmd.ExecuteReader();
            while (dr.Read() == true)
            {
                dataGridView1.Visible = true;
                dataGridView1.DataSource = dt; //binding datagrid with data
                x = x + 1; //Increment the value of x         
            }
//printing total count
            MessageBox.Show("Total Inquiry found " + x.ToString(),"Information",MessageBoxButtons.OK,MessageBoxIcon.Information);
            connect.Close();

        }

Do rate my answer once u find it useful

Thanks & Regards
Radix :)

If you are binding your gridview to a collection, you can actually get the count of the collection to get a count of your rows.